2011年4月16日星期六

First signs of Lake live, the sex on the beach

Loch_Torridon_-_geograph.org.uk_-_303272

A vacation Lake can much party time, if the weather is nice on the rays of the Sun, and include many shore-based romance.

Early life was too in the Sun and looking for love in lakes. Micro-organisms from Scotland fossilized Loch Torridon a billion-year-old complex structures, photosynthesis and sexual reproduction had made possible.

What makes this early eukaryotic fossils is important, that they came from what was once a closed. Development of the specialized structures in the cell as the nucleus, mitochondria and chloroplasts, had originally been thought, occur only in the oceans.

Cluster_of_cells_160 BLOG: Embryos show all animals share old genes

The biological equipment for one day enjoy sex and sunbathing had this Scottish fossils. The core is critical for, contains the genetic information and facilitate sexual reproduction. The chloroplasts allow organisms to turn sunlight into usable energy.

"It may even be that the kind of conditions in the old lakes around Loch Torridon is a major step in this transformation, which preferred the inclusion of symbiotic bacteria involved in the cell form chloroplasts, instead of this, taken in the sea than generally in the eye" said Martin BRASIER of the University of Oxford in a press release the University of Sheffield.

BLOG: Oceans can have poisoned early life

BRASIER was one of the authors of a paper detailing the old Scottish Lake residents published in nature. He worked with a team of scientists from Boston College, University of Sheffield and the University of Oxford, to uncover the fossils of rocks in the vicinity of Loch Torridon, on the West coast of Scotland.

Cell_pairs_160"During this time that continents are often referred to as essentially barren of life - or at most with an insignificant dominated microbial biota of cyanobacteria." "We proof of complex life in the country of 1 billion-year-old deposits from Scotland, have discovered," said Charles Wellman of the University of Sheffield in a press release from this school.

Some of the fossils which were washed of organisms that live in the Lake, but others were living in the country, of organisms in the sea and were petrified.

"This is an indication that life in the country at that time was abundant and complex than expected." "It opens the intriguing possibility that some of the most important events in the early history of life on the land and not fully in the area may have been marine", Wellman said.

Prokaryotes lived the fossils from the Scottish Lake an important time as simple single-celled organisms called, such as cyanobacteria, called designed to more complex organisms, eukaryotes. Many of the structures that advanced life, to use resources from their surroundings like sunlight missing prokaryotes.

Create prokaryotes not also capable of exchanging genes and offspring with a different genetic code. Without this process, which is the basic form of sex, income evolution much slower and less efficient.

With their sexual reproduction, the old Scottish Lake residents may have had a profound influence on life on Earth. "It was these organisms, which helped to make our landscape of a rough and rocky desert into a green and pleasant place", said BRASIER.

Figure 1: Loch Torridon, Scotland (Wikimedia Commons).

Figure 2: A cluster of cells, one of the fossils from Scotland. (Credit: Oxford University/Martin BRASIER).

Figure 3: couples, another example of fossils from Scotland cell. (Credit: Oxford University/Martin BRASIER).






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